@article{JGG_2014_18_1_JGG_2014_18_1_a0,
     author = {C. P. Avelino and A. F. Santos },
     title = {The {Differentiable} {Manifold} of {Spherical} {Deltoids:} {Their} {Classification}},
     journal = {Journal for geometry and graphics},
     pages = {1--6},
     publisher = {mathdoc},
     volume = {18},
     number = {1},
     year = {2014},
     url = {http://geodesic.mathdoc.fr/item/JGG_2014_18_1_JGG_2014_18_1_a0/}
}